glibc/sysdeps/x86/dl-get-cpu-features.c
Paul Eggert 2b778ceb40 Update copyright dates with scripts/update-copyrights
I used these shell commands:

../glibc/scripts/update-copyrights $PWD/../gnulib/build-aux/update-copyright
(cd ../glibc && git commit -am"[this commit message]")

and then ignored the output, which consisted lines saying "FOO: warning:
copyright statement not found" for each of 6694 files FOO.
I then removed trailing white space from benchtests/bench-pthread-locks.c
and iconvdata/tst-iconv-big5-hkscs-to-2ucs4.c, to work around this
diagnostic from Savannah:
remote: *** pre-commit check failed ...
remote: *** error: lines with trailing whitespace found
remote: error: hook declined to update refs/heads/master
2021-01-02 12:17:34 -08:00

55 lines
1.9 KiB
C

/* Initialize CPU feature data via IFUNC relocation.
Copyright (C) 2015-2021 Free Software Foundation, Inc.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <ldsodefs.h>
#ifdef SHARED
# include <cpu-features.c>
/* NB: Normally, DL_PLATFORM_INIT calls init_cpu_features to initialize
CPU features in dynamic executable. But when loading ld.so inside of
static executable, DL_PLATFORM_INIT isn't called and IFUNC relocation
is used to call init_cpu_features. In static executable, it is called
once by IFUNC relocation. In dynamic executable, it is called twice
by DL_PLATFORM_INIT and by IFUNC relocation. */
extern void __x86_cpu_features (void) attribute_hidden;
const void (*__x86_cpu_features_p) (void) attribute_hidden
= __x86_cpu_features;
void
_dl_x86_init_cpu_features (void)
{
struct cpu_features *cpu_features = __get_cpu_features ();
if (cpu_features->basic.kind == arch_kind_unknown)
init_cpu_features (cpu_features);
}
__ifunc (__x86_cpu_features, __x86_cpu_features, NULL, void,
_dl_x86_init_cpu_features);
#endif
#undef __x86_get_cpu_features
const struct cpu_features *
__x86_get_cpu_features (unsigned int max)
{
if (max > COMMON_CPUID_INDEX_MAX)
return NULL;
return &GLRO(dl_x86_cpu_features);
}